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Axial fans, 25 to 140 mm: frames and hole patterns
What is the screw hole spacing for 80 mm, 92 mm and 140 mm fans? · Hardware · basis: Industry-standard square axial fan frames (hole pattern = frame − 8 mm for 40 mm and larger except 140, which uses 124.5)
- sizes
- 10 in table
Notes
- Hole patterns: 25→20, 30→24, 40→32, 50→40, 60→50, 70→61.5, 80→71.5, 92→82.5, 120→105, 140→124.5 mm. Holes Ø4.3 from 50 mm up, Ø3.5 (M3) for 40 and Ø2.9 (M2.5) for 25/30.
- Thickness: 10 mm for 25–40, 15 for 50–70, 25 for 80–140 (15 mm slim 120s exist; 4020 is a 20 mm 40). Airflow arrows are moulded on the frame side.
- Print a grille/duct to the frame outer size + 0.5 mm; the files are the frame envelope with a solid hub so the duct can be checked for clearance.
Sizes
| frame_mm | hole_pattern_mm | hole_dia_mm | thickness_mm |
|---|---|---|---|
| 25 | 20 | 2.9 | 10 |
| 30 | 24 | 2.9 | 10 |
| 40 | 32 | 3.5 | 10 |
| 50 | 40 | 4.3 | 15 |
| 60 | 50 | 4.3 | 15 |
| 70 | 61.5 | 4.3 | 15 |
| 80 | 71.5 | 4.3 | 25 |
| 92 | 82.5 | 4.3 | 25 |
| 120 | 105 | 4.3 | 25 |
| 140 | 124.5 | 4.3 | 25 |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | Computer fan | web | CC BY-SA 4.0 (text) |
| McMaster-Carr | Equipment-cooling fans (free STEP/IGES/STL per part, for your own design use; no redistribution) | STEP, IGES, STL, PDF | McMaster-Carr site terms: personal design use, no redistribution verify |
Free files
★ Free files 12 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| fan-25x10 | 25 mm frame, 20 mm hole pattern, Ø2.9 holes, 10 thick | STEP · STL |
| fan-30x10 | 30 mm frame, 24 mm hole pattern, Ø2.9 holes, 10 thick | STEP · STL |
| fan-40x10 | 40 mm frame, 32 mm hole pattern, Ø3.5 holes, 10 thick | STEP · STL |
| fan-50x15 | 50 mm frame, 40 mm hole pattern, Ø4.3 holes, 15 thick | STEP · STL |
| fan-60x15 | 60 mm frame, 50 mm hole pattern, Ø4.3 holes, 15 thick | STEP · STL |
| fan-70x15 | 70 mm frame, 61.5 mm hole pattern, Ø4.3 holes, 15 thick | STEP · STL |
| fan-80x25 | 80 mm frame, 71.5 mm hole pattern, Ø4.3 holes, 25 thick | STEP · STL |
| fan-92x25 | 92 mm frame, 82.5 mm hole pattern, Ø4.3 holes, 25 thick | STEP · STL |
| fan-120x25 | 120 mm frame, 105 mm hole pattern, Ø4.3 holes, 25 thick | STEP · STL |
| fan-140x25 | 140 mm frame, 124.5 mm hole pattern, Ø4.3 holes, 25 thick | STEP · STL |
| fan-40x20 | 40 × 40 × 20 (4020) | STEP · STL |
| fan-120x15 | 120 × 120 × 15 slim | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=axial-fan-frames
Fits with
Questions
What is the 80 mm fan screw spacing?
71.5 × 71.5 mm, Ø4.3 holes, 25 mm thick standard.
What is the 140 mm fan hole spacing?
124.5 × 124.5 mm (some 140s also carry the 120 mm 105 × 105 pattern). Ø4.3 holes, 25 mm thick.
What is the 30 mm fan hole spacing?
24 × 24 mm, Ø2.9 holes (M2.5); 25 mm fans use 20 × 20. Both 10 mm thick (3010, 2510).
What is the 60 mm fan hole spacing?
50 × 50 mm, Ø4.3 holes; 15 or 25 mm thick.